[Interpreter] Add support for global declarations and load/store of global variables

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index ca792d3855761362bb2f38ba416d8719df2105cb..fd49267154128a082e629382376e2182eba71925 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -47,8 +47,12 @@ class BytecodeArrayBuilder {
   BytecodeArrayBuilder& LoadTrue();
   BytecodeArrayBuilder& LoadFalse();
 
-  // Global loads to accumulator.
+  // Global loads to accumulator and stores from accumulator.
   BytecodeArrayBuilder& LoadGlobal(int slot_index);
+  BytecodeArrayBuilder& StoreGlobal(int slot_index, LanguageMode language_mode);
+
+  // Load the object at |slot_index| in |context| into the accumulator.
+  BytecodeArrayBuilder& LoadContextSlot(Register context, int slot_index);
 
   // Register-accumulator transfers.
   BytecodeArrayBuilder& LoadAccumulatorWithRegister(Register reg);